and saw vice president biden, it happened to be right at the time when he was getting a call from president obama, congratulating him on his debate and one of the things paul ryan said to me is, he said, boy, you know, i really, it's great. i've been looking at a lot of tapes of you for a long time now and, boy, have you been to afghanistan a lot of times. >> do you know? >> reporter: i don't. i used to keep track in iraq. i can tell you, that was 21 times. but i think generally, to the region, pakistan, afghanistan, i've lost track but it's definitely dozens of times. >> all right, well, martha raddatz, it was a big job and you were absolutely masterful and head on out now and see you on the air next week. >> bye-bye, diane. >>> and as you heard, martha asked pointed questions about libya, benghazi and the violence that cost four americans their lives, including u.s. ambassador chris stevens. and what we heard last night reverberating throughout washington today, in a series of questions and challenges. what did the white house know about the danger? and the need for protection?